3937426,3931627,3903282,4948019,4947579. Fit For the Following Models. For Cummins 4B 4BT 4BTA 3.9 6B 6BT 6BTA 5.9 Engine. Note: This is a pull-off flywheel housing from an early 5.9 12 valve Cummins diesel engine. This is an SAE 3 size housing for your transmission bell-housing. The cast number on this housing is 3937426. It must match to your number to fit correctly. For HK/TW buyers, please notify us your government ID #. For BRA, AR, PER buyers, please leave us your CPF#, CUIT# or RUC# correspondingly. Our guarantee is only for the cost of the item, we will not be responsible for any other expenses such as installation, labor, towing, repair or any other related expenses.